Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 9, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this flash flood warning at May 17, 2021, 2:06 PM CDT for Liberty County, Texas. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 17, 2021, 2:06 PM CDT (19:06 UTC)
- Expired
- May 17, 2021, 5:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Liberty County, TX
The radar
The Houston radar (KHGX), 84 km from the middle of the area, began a volume at 19:09 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 17, 2:18 PM CDT | FLASH FLOOD | 2 Ssw Daisetta, TX | COUNTY ROAD 2017 SOUTH OF DAISETTA IS FLOODED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 7.1 hours before the alert went out and 144 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 626 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 699 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 314 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 10.3
The text
As transmitted.
014
WGUS54 KHGX 171906
FFWHGX
TXC291-172215-
/O.NEW.KHGX.FF.W.0009.210517T1906Z-210517T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Houston/Galveston TX
206 PM CDT Mon May 17 2021
The National Weather Service in League City has issued a
* Flash Flood Warning for...
Central Liberty County in southeastern Texas...
* Until 515 PM CDT.
* At 206 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 3 and 6 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Northeastern Liberty, Ames, Daisetta, Hardin, Plum Grove,
Kenefick, Devers, Dayton Lakes and Moss Hill.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Excessive run off from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
Stay away or be swept away. River banks and culverts can become
unstable and unsafe.
&&
LAT...LON 3011 9451 3010 9450 3001 9458 3004 9473
3016 9507 3019 9509 3031 9505 3034 9482
3020 9463 3017 9462 3015 9461 3014 9461
3011 9460 3011 9452
FLASH FLOOD...RADAR INDICATED
$$
CR1 follow-up statement
627
WGUS74 KHGX 172211
FFSHGX
Flash Flood Statement
National Weather Service Houston/Galveston TX
511 PM CDT Mon May 17 2021
TXC291-172221-
/O.EXP.KHGX.FF.W.0009.000000T0000Z-210517T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Liberty TX-
511 PM CDT Mon May 17 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 PM CDT THIS AFTERNOON FOR
CENTRAL LIBERTY COUNTY...
The heavy rain has ended, although light to moderate rain will
continue through the next couple of hours. Please continue to heed
remaining road closures.
A Flash Flood Watch remains in effect until 700 AM CDT Thursday for
portions of south central Texas and southeast Texas.
LAT...LON 3011 9451 3010 9450 3001 9458 3004 9473
3016 9507 3019 9509 3031 9505 3034 9482
3020 9463 3017 9462 3015 9461 3014 9461
3011 9460 3011 9452
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 7:56 PM CDT | Special Marine Warning | HGX | 34 min | |
| May 16, 8:27 PM CDT | River Flood Warning | HGX | Jackson | 11 hr |
| May 16, 8:42 PM CDT | Special Marine Warning | HGX | 48 min | |
| May 16, 10:16 PM CDT | Special Marine Warning | HGX | 44 min | |
| May 16, 11:11 PM CDT | Special Marine Warning | HGX | 64 min | |
| May 17, 1:16 AM CDT | Special Marine Warning | HGX | 89 min | |
| May 17, 2:45 AM CDT | Special Marine Warning | HGX | 45 min | |
| May 17, 12:57 PM CDT | Areal Flood Advisory | HGX | Liberty | 2 hr |
| May 17, 1:41 PM CDT | Flash Flood Watch | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 68 hr |
| May 17, 2:08 PM CDT | Special Weather Statement | HGX | San Jacinto | 52 min |
| May 17, 2:09 PM CDT | Areal Flood Advisory | HGX | Grimes, Montgomery, San Jacinto, Walker, Waller, Washington | 3 hr |
| May 17, 2:44 PM CDT | Special Weather Statement | HGX | Liberty, Montgomery | 46 min |
| May 17, 2:59 PM CDT | Areal Flood Advisory | HGX | Austin, Colorado, Harris, Liberty, Montgomery, San Jacinto and 2 more | 3 hr |
| May 17, 3:13 PM CDT | Areal Flood Advisory | HGX | Chambers, Harris, Liberty, Montgomery | 2 hr |
| May 17, 3:19 PM CDT | Special Weather Statement | HGX | Austin, Colorado | 56 min |
| May 17, 3:21 PM CDT | Flash Flood Warning | HGX | Chambers, Harris, Liberty | 3 hr |
| May 17, 3:23 PM CDT | Special Weather Statement | HGX | Chambers, Harris | 67 min |
| May 17, 3:46 PM CDT | Special Marine Warning | HGX | 89 min | |
| May 17, 4:08 PM CDT | Areal Flood Advisory | HGX | Harris | 112 min |
| May 17, 4:25 PM CDT | Special Weather Statement | HGX | Austin, Brazoria, Colorado, Fort Bend, Galveston, Harris and 1 more | 65 min |
| May 17, 5:02 PM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Galveston, Harris | 118 min |
| May 17, 5:07 PM CDT | River Flood Warning | HGX | Liberty | 36 days |
| May 17, 5:15 PM CDT | Special Marine Warning | HGX | 45 min | |
| May 17, 5:30 PM CDT | Special Marine Warning | HGX | 90 min | |
| May 17, 5:37 PM CDT | Areal Flood Advisory | HGX | Austin, Colorado, Fort Bend, Harris, Waller, Wharton | 113 min |
| May 17, 5:44 PM CDT | Special Weather Statement | HGX | Fort Bend | 61 min |
| May 17, 6:14 PM CDT | Areal Flood Advisory | HGX | Brazoria, Fort Bend, Galveston, Harris, Matagorda, Wharton | 2 hr |
Nearby
Flash Flood Warnings in Texas, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.